The use of wind power was first tried in the 20th century.
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Q6: Conventional solar cells contain layers of
A)carbon
B)silicon
C)zinc
D)tin
Q7: Solar power requires backup systems for
A)windy days
B)cold
Q8: The first practical photocell was developed in
Q9: Active solar heating requires a _ between
Q10: The Stirling engine, developed in 1816, converts
A)motion
Q12: The leader using wind power in the
Q13: Worldwide, the leader using wind power is
A)China
B)Germany
C)Spain
D)US
Q14: Disadvantages of wind power include
A)disturbs wildlife
B)interferes with
Q15: Advantages of wind power are
A)high net energy
Q16: The Earth's core maintains a temperature of
A)200
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